Influence of
magnesium pre-treatment during repetitive
hypoxia was studied in the hippocampus of rats by histochemical analysis (
NADPH-diaphorase staining).
NADPH-diaphorase occurs concurrently with
NO-synthase that is responsible for NO synthesis. Rat pups were kept together with their mother for 8 hours a day in a hypobaric chamber at a simulated altitude of 7,000 m since the day of birth till the 17th day. The first group of animals was exposed to the repeated
hypoxia; the second group under the same conditions was pre-treated by
magnesium before the exposition to the
hypoxia. Both groups were compared with intact control animals and intact animals treated with
magnesium. The experimental and control animals were the transaortically perfused with 4% buffered neutral
formaldehyde under
thiopental anaesthesia at the age of 35 days. Brains were processed for
NADPH-d staining. We estimated the density of
NADPH-d positive neurons in CA1 and CA3 areas of the hippocampus and in the dentate gyrus. Intermittent
hypoxia brings about higher numbers of
NADPH-diaphorase positive neurons of CA1 and CA3 of the hippocampus and of the dorsal blade of dentate gyrus, in the comparison with either group of control animals. In the hilus and ventral blade of the dentate gyrus, on the contrary, the number of
NADPH-d positive neurons was smaller.
Magnesium pre-treatment during
hypoxia decreased number of nitrergic neurons in all areas of the hippocampus except CA1 area, where the effect of
magnesium was not significant. These results demonstrate that
magnesium can probably have a
neuroprotective effect.